"Run, hide, fight" is standard protocol for active shooter situations. It means: Run, evacuate if possible; Hide, get silently out of view; or Fight, as a last resort, take action to disrupt or incapacitate the shooter if your life is in imminent danger.

The university followed up with another tweet: "Continue to shelter in place in north campus area. Follow directions of Police on scene." The university asked for anyone with information to call police.

The Columbus Police Department referred calls to Ohio State. A dispatcher for Ohio State police declined to comment. The media relations office said it wasn't immediately able to comment.

No more information was immediately available. A Columbus police dispatcher declined to comment on the reports, but police vehicles were seen at the scene.